Why is the mistake in line 26?

Question

https://code.sololearn.com/cqBmln0Uj3zw/?ref=app

Answer 1

Tag "Python", NOT YOUR NAME.

You did not assign a string to "operatation", so it is "None".

Answer 2

Operations should not be performed inside double quotes because double quotes means string

you didn't use that 2 variables first_number and second_number

Answer 3

What error you are seeing in line 26?

But you are using print instead of input for operation input!!!

Answer 4

first_number=int(input("enter first number: "))
for take the input, the same for the second number and for the operation without int